From: Sahid Orentino Ferdjaoui <sahid.ferdjaoui@xxxxxxxxxx>
<devices>
<interface type='ethernet'>
<mac address='52:54:00:23:bc:ba'/>
<model type='virtio'/>
<driver name="vhost" poll_us='50'/>
</interface>
</devices>
That option is supported for all networks which are using a tap
device.
To be used the backend should be specificly set to use vhost.
Signed-off-by: Sahid Orentino Ferdjaoui <sahid.ferdjaoui@xxxxxxxxxx>
---
Addressed comments:
- Added comment to explain why we should explicitly
set the driver name.
src/qemu/qemu_command.c | 28 ++++++++++++++++++++++
src/qemu/qemu_hotplug.c | 12 ++++++++++
.../qemuxml2argv-net-virtio-netdev-pollus-fail.xml | 23 ++++++++++++++++++
...xml2argv-net-virtio-netdev-pollus-qemu-fail.xml | 23 ++++++++++++++++++
.../qemuxml2argv-net-virtio-netdev-pollus.args | 25 +++++++++++++++++++
.../qemuxml2argv-net-virtio-netdev-pollus.xml | 23 ++++++++++++++++++
tests/qemuxml2argvtest.c | 9 +++++++
7 files changed, 143 insertions(+)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus-fail.xml
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus-qemu-fail.xml
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus.args
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus.xml
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 6ac26af..1fc2a88 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3899,6 +3899,9 @@ qemuBuildHostNetStr(virDomainNetDefPtr net,
}
if (net->tune.sndbuf_specified)
virBufferAsprintf(&buf, "sndbuf=%lu,", net->tune.sndbuf);
+ if (net->driver.virtio.poll_us)
+ virBufferAsprintf(&buf, "poll-us=%u,",
+ net->driver.virtio.poll_us);
}
virObjectUnref(cfg);
@@ -8330,6 +8333,31 @@ qemuBuildInterfaceCommandLine(virQEMUDriverPtr driver,
return -1;
}
+ if (net->driver.virtio.poll_us > 0) {
+ if (net->driver.virtio.name != VIR_DOMAIN_NET_BACKEND_TYPE_VHOST) {
+ /* virtio.name is set only if driver is specificly
+ * indicated. Since 'poll_us' option is only available for
+ * vhost-net we don't want libvirt to fallback to QEMU if
+ * not available. That's why we request users to set the
+ * driver. */
+ virReportError(
+ VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Busy polling (poll_us) is only supported with vhost "
+ "backend driver"));
+ return -1;
+ }
+ /* Nothing besides TAP devices supports busy polling. */
+ if (!(actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
+ actualType == VIR_DOMAIN_NET_TYPE_BRIDGE ||
+ actualType == VIR_DOMAIN_NET_TYPE_DIRECT ||
+ actualType == VIR_DOMAIN_NET_TYPE_ETHERNET)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Busy polling is not supported for: %s"),
+ virDomainNetTypeToString(actualType));
+ return -1;
+ }
+ }
+
/* and only TAP devices support nwfilter rules */
if (net->filter &&
!(actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 4bc4972..78f61e7 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1015,6 +1015,18 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver,
return -1;
}
+ /* and nothing besides TAP devices supports busy polling. */
+ if (net->driver.virtio.poll_us > 0 &&
+ !(actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
+ actualType == VIR_DOMAIN_NET_TYPE_BRIDGE ||
+ actualType == VIR_DOMAIN_NET_TYPE_DIRECT ||
+ actualType == VIR_DOMAIN_NET_TYPE_ETHERNET)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Busy polling is not supported for: %s"),
+ virDomainNetTypeToString(actualType));
+ return -1;
+ }
+
/* and only TAP devices support nwfilter rules */
if (net->filter &&
!(actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus-fail.xml b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus-fail.xml
new file mode 100644
index 0000000..3b664b9
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus-fail.xml
@@ -0,0 +1,23 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219100</memory>
+ <currentMemory unit='KiB'>219100</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-i686</emulator>
+ <interface type='ethernet'>
+ <mac address='52:54:00:23:bc:ba'/>
+ <model type='virtio'/>
+ <driver poll_us='50'/>
+ </interface>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus-qemu-fail.xml b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus-qemu-fail.xml
new file mode 100644
index 0000000..18999c3
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus-qemu-fail.xml
@@ -0,0 +1,23 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219100</memory>
+ <currentMemory unit='KiB'>219100</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-i686</emulator>
+ <interface type='ethernet'>
+ <mac address='52:54:00:23:bc:ba'/>
+ <model type='virtio'/>
+ <driver name="qemu" poll_us='50'/>
+ </interface>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus.args b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus.args
new file mode 100644
index 0000000..15e26fb
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus.args
@@ -0,0 +1,25 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-i686 \
+-name QEMUGuest1 \
+-S \
+-M pc \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=readline \
+-no-acpi \
+-boot c \
+-usb \
+-netdev tap,fd=3,id=hostnet0,poll-us=50 \
+-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:23:bc:ba,bus=pci.0,\
+addr=0x3 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus.xml b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus.xml
new file mode 100644
index 0000000..46ef7d6
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-netdev-pollus.xml
@@ -0,0 +1,23 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219100</memory>
+ <currentMemory unit='KiB'>219100</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-i686</emulator>
+ <interface type='ethernet'>
+ <mac address='52:54:00:23:bc:ba'/>
+ <model type='virtio'/>
+ <driver name="vhost" poll_us='50'/>
+ </interface>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index b95ea46..8311d9a 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1156,6 +1156,15 @@ mymain(void)
QEMU_CAPS_NODEFCONFIG);
DO_TEST("net-virtio-netdev",
QEMU_CAPS_NETDEV, QEMU_CAPS_NODEFCONFIG);
+ DO_TEST("net-virtio-netdev-pollus",
+ QEMU_CAPS_NETDEV,
+ QEMU_CAPS_NETDEV_POLL_US);
+ DO_TEST_FAILURE("net-virtio-netdev-pollus-fail",
+ QEMU_CAPS_NETDEV,
+ QEMU_CAPS_NETDEV_POLL_US);
+ DO_TEST_FAILURE("net-virtio-netdev-pollus-qemu-fail",
+ QEMU_CAPS_NETDEV,
+ QEMU_CAPS_NETDEV_POLL_US);
DO_TEST("net-virtio-s390",
QEMU_CAPS_VIRTIO_S390);
DO_TEST("net-virtio-ccw",
--
2.9.4
--
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